We have seen a few mounts for the Mac mini in our time, but this might be the most clever of them all. The MiniHitch ($49.95) from CompWave allows you to mount a Mac mini on the back of your monitor, by making use of the 100mm or 75mm spacing VESA pattern mounting holes found on the back of many LCD monitors. CompWave also offers the CamHitch ($15.95), which allows you to mount an Apple iSight on the back of your monitor, by making use of one of the VESA mounting holes as well as the notebook mount that comes with the iSight.

It seems to me to be a novelty item. What sense does it make to hang your mini onto the back of your monitor? If your using larger than a 20" monitor it makes it so you would have to stand up to load and unload your discs and turn your mini on and off. Most of the larger monitors out there have enough room between the screen and the base to keep a mini out of the way and still accesable.
Also is it so wise to mount this thing to one of the hottest parts of your monitor?